EP2171253A1 - Aktoreinheit für ein einspritzsystem einer brennkraftmaschine - Google Patents
Aktoreinheit für ein einspritzsystem einer brennkraftmaschineInfo
- Publication number
- EP2171253A1 EP2171253A1 EP08775064A EP08775064A EP2171253A1 EP 2171253 A1 EP2171253 A1 EP 2171253A1 EP 08775064 A EP08775064 A EP 08775064A EP 08775064 A EP08775064 A EP 08775064A EP 2171253 A1 EP2171253 A1 EP 2171253A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- thermal expansion
- piezoelectric actuator
- coefficient
- aktorgehause
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/167—Means for compensating clearance or thermal expansion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/88—Mounts; Supports; Enclosures; Casings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/42—Piezoelectric device making
Definitions
- the invention relates to an actuator unit for an injection system of an internal combustion engine according to the features of the preamble of patent claim 1.
- Actuator units with piezoelectric actuator elements are used, for example, for fuel injection in combustion chambers of internal combustion engines.
- the piezoelectric actuator elements are preferably made of ceramic and are arranged m an Aktorgehause, which consists for example of Invar. Since the different materials of the Aktorgehauses and the piezoelectric actuator element have different values for the respective coefficient of thermal expansion, it may come to a change in the temperature acting on the actuator temperature to different long changes of the piezoelectric actuator element and the Aktorgehauses. As a result, the position of the piezoelectric actuator element can shift with respect to an actuator, so that the operative connection between the piezoelectric actuator element and the actuator is correspondingly influenced.
- an actuator unit wherein the length changes, the gate element are due to under ⁇ Kunststoffaji coefficient of thermal expansion for the various materials of the actuator housing and piezoelectric AK- be compensated for by the fact that the actuator housing from an inner, middle, and outer sleeve. At least two sleeves have a different thermal expansion coefficient. The materials of the sleeves are selected such that due to the different thermal expansion coefficients of the individual sleeves, the different long changes on Aktorgehause and the piezoelectric actuator element are compensated.
- the present invention is based the task now is to provide an alternative solution for an actuator unit, by means of the different expansions of the Langenaus- actuator housing and of the piezoelectric Aktore ⁇ lements may be as simple as possible, balanced.
- the advantages achieved by the invention are in particular that, starting from a known coefficient of thermal expansion of the piezoelectric actuator element, the different elongation of the Aktorgehauses and the piezoelectric actuator element in the axial direction is compensated by the fact that on the Aktorgehause a force equalization effecting fastener is arranged , Un ⁇ is terstutzt this by choice of Warmeausdehnungskoef- of the actuator housing and fastener coefficient such that one of the materials has a compared to the coefficient of thermal expansion of the piezoelectric actuator element larger thermal expansion coefficient and the other material has a smaller compared to the coefficient of thermal expansion of the piezoelectric actuator element coefficient of thermal expansion.
- the fastening means is designed as a clamping nut and attached to a mounted on the actuator housing thread.
- the arrangement of the clamping nut on Aktorgehause offers the advantage that the different Langenanderun- conditions of Aktorgehauses and the piezoelectric actuator element takes place without a change in shape of the actuator.
- an inexpensive and fast post-processing of the actuator is possible.
- a further advantageous embodiment of the invention is that a fine adjustment of the compensation of the different long extensions of Aktorgehauses and the piezoelectric actuator element takes place over the length of the engaging in the thread part of the clamping nut.
- the length of the engaging in the thread of Aktorgehauses part of the clamping nut depends on the thermal expansion coefficient of the piezoelectric element.
- the advantage therefore, is that by a sole change in length of the engaging in the thread of Aktorgehauses part of the clamping nut under ⁇ different long changes of the same material, which may occur, for example, in a delivery of the same material by different manufacturers, be avoided.
- Figure 1 a sectional view of an actuator.
- FIG. 1 shows a sectional view of an actuator unit.
- the actuator unit 1 has a piezoelectric actuator element 13, which is arranged within an actuator housing 14.
- the piezoelectric actuator element 13 is connected at one end to a head element 11 and at the opposite end to a bottom element 12.
- a fastening element 10 is arranged on the actuator housing 14.
- the piezoelectric actuator element 13 consists of ceramic, the Aktorgehause 14 made of nickel steel, and the fastener 10 made of steel.
- the thermal expansion coefficient of the fixing member 10 is smaller than the thermal expansion coefficient of the piezoelectric actuator element 13, and simultaneously, the thermal expansion coefficient of the actuator housing 14 is larger than the furnishedausdehnungskoef ⁇ fizient of the piezoelectric actuator element 13.
- the greater thermal expansion coefficients of the actuator housing 14 compared to the piezoelectric actuator 13 too large elongation of Aktorgehauses 14.
- This compared to the piezoelectric actuator 13 too large elongation is compensated by the fastener 10 insofar as now due to the lower coefficient of thermal expansion of the fastener 10 against the axial direction of movement of Aktorgehauses 14th directed force acts on the Aktorgehause 14.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007033033.4A DE102007033033B4 (de) | 2007-07-16 | 2007-07-16 | Aktoreinheit für ein Einspritzsystem einer Brennkraftmaschine |
| PCT/EP2008/059204 WO2009010501A1 (de) | 2007-07-16 | 2008-07-15 | Aktoreinheit für ein einspritzsystem einer brennkraftmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2171253A1 true EP2171253A1 (de) | 2010-04-07 |
| EP2171253B1 EP2171253B1 (de) | 2011-09-14 |
Family
ID=39847116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08775064A Not-in-force EP2171253B1 (de) | 2007-07-16 | 2008-07-15 | Aktoreinheit für ein einspritzsystem einer brennkraftmaschine |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US8368288B2 (de) |
| EP (1) | EP2171253B1 (de) |
| JP (1) | JP5453257B2 (de) |
| CN (1) | CN102016287B (de) |
| AT (1) | ATE524651T1 (de) |
| DE (1) | DE102007033033B4 (de) |
| WO (1) | WO2009010501A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TR201713993A2 (tr) * | 2017-09-21 | 2019-04-22 | Bosch Sanayi Ve Tic A S | Bi̇r yakit enjektörü |
| DE102022204014B3 (de) * | 2022-04-26 | 2022-12-08 | Carl Zeiss Smt Gmbh | Temperaturinsensitiver Aktuator und Deformationsspiegel |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1601306A (en) | 1978-05-08 | 1981-10-28 | Philips Electronic Associated | Fluidcontrol valve |
| US4471256A (en) * | 1982-06-14 | 1984-09-11 | Nippon Soken, Inc. | Piezoelectric actuator, and valve apparatus having actuator |
| JPS60104762A (ja) | 1983-11-10 | 1985-06-10 | Nippon Soken Inc | 電歪式アクチュエータ及びそれを用いた燃料噴射弁 |
| JPH07310842A (ja) * | 1994-05-19 | 1995-11-28 | Fujikin:Kk | 微流量調整弁 |
| DE19538791C2 (de) * | 1995-10-18 | 1998-04-09 | Daimler Benz Ag | Piezosteuerventil für Kraftstoffeinspritzanlagen von Brennkraftmaschinen |
| DE59811027D1 (de) | 1997-04-04 | 2004-04-29 | Siemens Ag | Einspritzventil mit Mitteln zur Kompensation der thermischen Längenänderung eines Piezoaktors |
| JPH11280932A (ja) | 1998-03-31 | 1999-10-15 | Taiheiyo Cement Corp | 駆動装置 |
| DE19909106C2 (de) | 1999-03-02 | 2001-08-23 | Siemens Ag | Temperaturkompensierte piezoelektrische Aktoreinheit |
| US6313568B1 (en) * | 1999-12-01 | 2001-11-06 | Cummins Inc. | Piezoelectric actuator and valve assembly with thermal expansion compensation |
| DE10149915A1 (de) | 2001-10-10 | 2003-04-24 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
| DE10303855A1 (de) | 2003-01-30 | 2004-08-19 | Dbt Automation Gmbh | Piezo-Aktor und Schaltvorrichtung für Ventile |
| DE10340319A1 (de) * | 2003-09-02 | 2005-03-24 | Robert Bosch Gmbh | Ventileinrichtung, insbesondere Kraftstoffeinspritzventil für eine Brennkraftmaschine |
| DE102004001679B4 (de) * | 2004-01-12 | 2009-01-08 | Continental Automotive Gmbh | Piezoaktor mit Mitteln zur Kompensation der thermischen Längenänderung und Kraftstoff-Einspritzventil mit Piezoaktor |
| US8100346B2 (en) * | 2007-11-30 | 2012-01-24 | Caterpillar Inc. | Piezoelectric actuator with multi-function spring and device using same |
| US7762236B2 (en) * | 2008-07-16 | 2010-07-27 | Transonic Combustion, Inc. | Piezoelectric fuel injector having a temperature compensating unit |
-
2007
- 2007-07-16 DE DE102007033033.4A patent/DE102007033033B4/de not_active Expired - Fee Related
-
2008
- 2008-07-15 CN CN2008800246818A patent/CN102016287B/zh not_active Expired - Fee Related
- 2008-07-15 EP EP08775064A patent/EP2171253B1/de not_active Not-in-force
- 2008-07-15 AT AT08775064T patent/ATE524651T1/de active
- 2008-07-15 WO PCT/EP2008/059204 patent/WO2009010501A1/de not_active Ceased
- 2008-07-15 JP JP2010516484A patent/JP5453257B2/ja not_active Expired - Fee Related
- 2008-07-15 US US12/669,071 patent/US8368288B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009010501A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102016287A (zh) | 2011-04-13 |
| EP2171253B1 (de) | 2011-09-14 |
| DE102007033033A1 (de) | 2009-01-22 |
| JP2010533812A (ja) | 2010-10-28 |
| US20100194244A1 (en) | 2010-08-05 |
| DE102007033033B4 (de) | 2019-08-08 |
| CN102016287B (zh) | 2013-10-23 |
| US8368288B2 (en) | 2013-02-05 |
| JP5453257B2 (ja) | 2014-03-26 |
| ATE524651T1 (de) | 2011-09-15 |
| WO2009010501A1 (de) | 2009-01-22 |
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